Question

Which of the following statement is incorrect?
(1) 3s orbital is lower in energy than 3p orbital for N-atom
2 (2) All five orbitals of d subshell have the same energy in H-atom
(3) Screening effect of 3p orbital is more than 3s orbital
(4) Number of angular nodes present in 2s orbital is zero
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Answer 1

Because Zeff is larger for the 3s electrons, they have a lower energy (are more stable) than the 3p, which, in turn, are lower in energy than the 3d. Again, we can generalize: In a many-electron atom, for a given value of n, the energy of an orbital increases with increasing value of l.